The item is an IBM 1401 Data Processing System Program Card produced by International Business Machines Corporation (IBM) in 1961. The document presents a card-sized reference for operation instructions, transmission and storage controls, and word-mark conventions used by the IBM 1401 data processing system. It includes a catalog-like transcription of operation codes, their associated instructions, storage and register interactions, and remarks relating to conditions under which operations proceed, stop, or are chained. The sheet is organized with a header indicating “1401 DATA PROCESSING SYSTEM PROGRAM CARD” and a tabular layout of operation codes, instructions, and timing/controls that govern card read/write, punching, feeding, branching, and storage operations, as well as details on disk and tape I/O, GM-WM (group-mark with a word-mark) usage, and field conventions. The material supports understanding the machine-level programming environment and the specific card-based control mechanism used by the IBM 1401 system in the early 1960s.

Evidence of production and date is present on the card (©1961 by IBM) with a White Plains, NY address, indicating its origin from IBM’s Data Processing Division. The primary subject is the IBM 1401, and the document is intended for operators or programmers using the IBM 1401’s Program Card to manage data processing tasks, tape and disk I/O, and word-mark conventions.

Overall, this item serves as a historical reference for early computer data processing workflows, especially regarding IBM 1401 program control via punched card instructions and associated storage and I/O behaviors.